package com.baomidou.kisso.common.bcprov.asn1;

import java.io.IOException;

import com.baomidou.kisso.common.bcprov.util.Arrays;
import com.baomidou.kisso.common.bcprov.util.Strings;

/**
 * DER VisibleString object.
 */
public class DERVisibleString extends ASN1Primitive implements ASN1String {

	private byte[] string;


	/**
	 * return a Visible String from the passed in object.
	 *
	 * @exception IllegalArgumentException if the object cannot be converted.
	 */
	public static DERVisibleString getInstance( Object obj ) {
		if ( obj == null || obj instanceof DERVisibleString ) {
			return (DERVisibleString) obj;
		}

		if ( obj instanceof byte[] ) {
			try {
				return (DERVisibleString) fromByteArray((byte[]) obj);
			} catch ( Exception e ) {
				throw new IllegalArgumentException("encoding error in getInstance: " + e.toString());
			}
		}

		throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
	}


	/**
	 * return a Visible String from a tagged object.
	 *
	 * @param obj the tagged object holding the object we want
	 * @param explicit true if the object is meant to be explicitly
	 *              tagged false otherwise.
	 * @exception IllegalArgumentException if the tagged object cannot
	 *               be converted.
	 */
	public static DERVisibleString getInstance( ASN1TaggedObject obj, boolean explicit ) {
		ASN1Primitive o = obj.getObject();

		if ( explicit || o instanceof DERVisibleString ) {
			return getInstance(o);
		} else {
			return new DERVisibleString(ASN1OctetString.getInstance(o).getOctets());
		}
	}


	/**
	 * basic constructor - byte encoded string.
	 */
	DERVisibleString( byte[] string ) {
		this.string = string;
	}


	/**
	 * basic constructor
	 */
	public DERVisibleString( String string ) {
		this.string = Strings.toByteArray(string);
	}


	public String getString() {
		return Strings.fromByteArray(string);
	}


	public String toString() {
		return getString();
	}


	public byte[] getOctets() {
		return Arrays.clone(string);
	}


	boolean isConstructed() {
		return false;
	}


	int encodedLength() {
		return 1 + StreamUtil.calculateBodyLength(string.length) + string.length;
	}


	void encode( ASN1OutputStream out ) throws IOException {
		out.writeEncoded(BERTags.VISIBLE_STRING, this.string);
	}


	boolean asn1Equals( ASN1Primitive o ) {
		if ( !(o instanceof DERVisibleString) ) {
			return false;
		}

		return Arrays.areEqual(string, ((DERVisibleString) o).string);
	}


	public int hashCode() {
		return Arrays.hashCode(string);
	}
}
